I'm running ZFS on Linux on my workstation, and have been for about two years:

[  273.779699] SPL: Loaded module v0.6.4.2-1~vivid
[  273.824212] ZFS: Loaded module v0.6.4.2-1~vivid, ZFS pool version 5000, ZFS filesystem version 5
[  280.179534] SPL: using hostid 0x007f0101

It works great, except that a couple of months ago I upgraded to Ubuntu 15.04. When I rebooted after the upgrade, the ZFS pool was not seen. At first I panicked, but when I had zpool search my devices it found the missing pool. Running "zpool import store" works fine, and everything mounts as it ought to. Until the next time I reboot.

Everytime I reboot ZFS appears to forget about my pool. However, I can't see anything obviously wrong:

$ sudo zpool list -Hv
store   1.30T   301G    1.00T   -       22%     22%     1.17x   ONLINE  -
        sda4    432G    135G    297G    -       31%     31%
        sdb3    896G    167G    729G    -       19%     18%

I also don't see anything obviously wrong in the partition tables:

$ sudo parted -l
Model: ATA ST500DM002-1BD14 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system  Name                  Flags
 1      1049kB  512MB   511MB   fat32        EFI System Partition  msftdata
 2      512MB   35.5GB  35.0GB  ext4
 4      35.5GB  500GB   465GB   zfs

Model: ATA WDC WD1002FAEX-0 (scsi)
Disk /dev/sdb: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system     Name  Flags
 1      1049kB  10.0GB  9999MB  linux-swap(v1)
 2      10.0GB  35.0GB  25.0GB  xfs
 3      35.0GB  1000GB  965GB   zfs

Any guidance about where to look, or what to do would be very much appreciated.

3 Answers 3


Check /etc/default/zfs and make sure it's set to:


  • This doesn't solve the problem. When I reboot 'zpool list' is empty and I have to import it by hand. I have also read documentation to the effect that these are no longer necessary (although I did try them again, just to be sure.) Jul 27, 2015 at 15:01

Be sure to have ubuntu-zfspackage installed, as it provides the correct pinning for the mountallcommand. See https://github.com/zfsonlinux/pkg-zfs/wiki/Ubuntu-ZFS-mountall-FAQ-and-troubleshooting for more details


have a look into and change /etc/init/zpool-import.conf

modprobe zfs zfs_autoimport_disable=1


modprobe zfs zfs_autoimport_disable=0

  • I already had ubuntu-zfs installed. The zfs_autoimport_disable flag was set to 1, so I set it to 0 and rebooted. I still had no pools listed. I also removed the zfs module from modprobe.d list as suggested by the common mistakes. Still no joy. I'll look at some of the other suggestions later. Thanks, though! Jul 27, 2015 at 15:52

I updated the ZFS packages this week and the problem simply vanished. It must have been a bug somewhere that got fixed. Everything is good again.

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